Enhancement of field squeezing using coherent feedback

John Edward Gough, Sebastian Wildfeuer

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65 Citations (SciVal)
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The theory of quantum feedback networks has recently been developed with the aim of showing how quantum input-output components may be connected together so as to control, stabilize, or enhance the performance of one of the subcomponents. In this paper, we show how the degree to which an idealized component (a degenerate parametric amplifier in the strong-coupling regime) can squeeze input fields may be enhanced by placing the component in loop in a simple feedback mechanism involving a beam splitter. We study the spectral properties of output fields, placing particular emphasis on the elastic and inelastic components of the power density.
Original languageEnglish
Article number042107
Pages (from-to)2536-2547
Number of pages11
JournalPhysical Review A
Issue number4
Publication statusPublished - 14 Oct 2009


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